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Rent Expense (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Rent Expense [Line Items] |  |
Annual Rent | $ 650,000 | $ 601,000
Auburn, Washington |  |
Rent Expense [Line Items] |  |
Annual Rent | 25,000 |
Lease Expiration Date | Month to Month |
Baton Rouge, Louisiana |  |
Rent Expense [Line Items] |  |
Annual Rent | 27,000 |
Lease Expiration Date | Month to Month |
Champaign, Illinois |  |
Rent Expense [Line Items] |  |
Annual Rent | 258,000 |
Lease Expiration Date | Dec. 31, 2014 |
Charlotte, North Carolina |  |
Rent Expense [Line Items] |  |
Annual Rent | 61,000 |
Lease Expiration Date | Mar. 31, 2016 |
Hampstead, New Hampshire |  |
Rent Expense [Line Items] |  |
Annual Rent | 24,000 |
Lease Expiration Date | Aug. 31, 2017 |
Pearl River, New York |  |
Rent Expense [Line Items] |  |
Annual Rent | 105,000 |
Lease Expiration Date | Aug. 31, 2018 |
Pottsboro, Texas |  |
Rent Expense [Line Items] |  |
Annual Rent | 18,000 |
Lease Expiration Date | Aug. 31, 2014 |
Stony Point, New York |  |
Rent Expense [Line Items] |  |
Annual Rent | 106,000 |
Lease Expiration Date | Jun. 30, 2016 |
Tulsa, Oklahoma |  |
Rent Expense [Line Items] |  |
Annual Rent | $ 26,000 |
Lease Expiration Date | Dec. 31, 2014 |

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- Definition Lease Expiration Period Description + References No definition available. + Details
Name: | hdsn_LeaseExpirationPeriodDescription
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | hdsn_RentExpenseLineItems
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration